I have trouble to understand this sentence, especially the part of " questa sia una delle bombe piu grandi", are we talking about single or plural here? Literally, how is it translated in English?

Grazie.

I will have a go, stand back and wait for corrections!
Regarding the part which confuses you, I think it's "this is one of the biggest unexploded bombs ever found in Milan".
una delle-one of the, bombe piu' grandi-biggest bombs

I have trouble to understand this sentence, especially the part of " questa sia una delle bombe piu grandi", are we talking about single or plural here? Literally, how is it translated in English?

Grazie.

I will have a go, stand back and wait for corrections!
Regarding the part which confuses you, I think it's "this is one of the biggest unexploded bombs ever found in Milan".
una delle-one of the, bombe piu' grandi-biggest bombs

Am I on the right track folks?

EDIT- Sorry Roby, didn't see your post

Carlo wrote:

"Si pensa", although impersonal, in a way means "experts think that...". Could you say "It is thought/considered to be one of the biggest..."?